Figure 3.

Three types of electrode configuration used in multiple-channel implants. The illustration at the left shows the monopolar mode, in which current from the active electrodes on the intracochlear array flows to a single “ground” electrode, which is located remotely. The center illustration shows the bipolar mode, in which current passes between two active electrodes located nearby on the array. The illustration at the right shows the “common ground” mode, in which current from one intracochlear electrode flows to most or all of the remaining electrodes on the array.